|June 17, 2015, 05:44||
combined convection radiation boundary
Join Date: Apr 2015
Posts: 14Rep Power: 2
I am currently investigating a cavity which is subject to radiation from a solar simulator (an assembly of mirrors and a Xe arc lamp) and the convective losses from it.
Therefore, I set up a large cylindrical fluid domain around the cavity in order for the walls not to influence the buoyancy-driven flow around the cavity.
From a raytracing code I obtain radiative fluxes on the different surfaces within the cavity, but as the cavity is open there is a certain fraction of reradiation from those surfaces leaving the cavity and heating up the surrounding walls. (which sooner or later results in a solver blowup)
I attempted to model the surroundings as openings but I got very unphysical and large mass fluxes and velocities so I decided to keep the setup as an enclosure.
I am now in need for a boundary condition for these surrounding walls, which acts as a fully transparent wall, such that the surroundings are not constantly heated by reradiation.
I would be very happy to read about any experiences you have with this issue.
Meanwhile, my first attempt will be an inet/outlet, setting all velocity components to zero, blackbody T to 0 and T to T_inf (about 293K).
Please discuss with me the degree of modelling absurdity I am proposing...
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